2(a^2+1/a^2)-(a-1/a)-7
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2(a^2+1/a^2)-(a-1/a)-7
= 2a^2 + 2/a^2 - (-1) -7
= 2a^2 + 2/a^2 + 1 -7
= 2a^2 + 2/a^2 - 6
= 2a^4 + 2 - 6a^2/a^2. { By LCM}
= -2a^2/a^2
= -2
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